Air-cooled rotary valve



July 7, 1925.

J. SHAW 'AIR COOLED ROTARY VALVE Filed Oei. 25, 1923 llllll f 1,188,496,Adaad June combination of engine parts,

' tericrs ofthe valve and its casing,

, specifica-tion.

UNITED STATE-s 12A-'TENT OFFICE.

JAMES SHAW, OF LODI, CALIFORNIA, ASSIGNOB T0 H. S. MON-LAW TRUST 0FILLINOIS.

MOTOR* COMPANY, A cou'- Aia-coorni: nc'ranrvanvn Application led October25, 1923. Serial No. 670,762.

l To all .whom it may concern:

Be it known that I, JAMES SHAW, a citizen 'of the United StatesofAmerica, residin at Lodi, in the county of San Joaquin' an State ofCalifornia, have `invented certain new and useul Improvements inAir-Cooled Rotary4 Valves, of'- which the following is a This inventionrelatesto means for coolin g the rotaryjvalves and ,associated parts ofexplosion engines, .and more especially the typeof-such .valves .whichform the subject matter of my prior'Letters Patent N o. 27th, 1916,and'iNo. 1,292,103, dated January present improvements havens theirobject To proyide a structural .formation and whereby Vcoolmg currentsof atmospheric air are intermittently drawn through the hollow inby themovement of the enginepiston, to attain an 'eiliective coolingof saidlparts.

To provide a supplementary construction of arts whereby both-the up'andv down str es of the engine'piston are -utilized to attain the abovementioned cooling of the valve and valve casing, and in ,one part of thecycle of"operation of the engine, utilize. a-portiorf of the aircompressed in the crank casing as an auxiliary scavenging means for,

the combustion chamber, and?. at 'another part of such cycle ofoperation admit a portion of such air from the 'crankz casing into thecombustion chamber to. add ,more air and) -eiect a dilution of theuncompressed gasecus fuel charge in saidchanfber, all as willhereinafter more fully appear.

In the accomanyingdrawingzf Fig. 1 is a vertical transverse section ofan explosion engine having Ithe "present improvement ap lied.

Fig. 2, is a orizontal sectipn on line 2--2 Fig. 1, of the rotary valveand its casing.

Fig. 3, is a detail section on linee-3 1, of the crank casing ofamultlcylinder engine of the present type. Like reference numeralsindicate like parts in the diii'erent views.

the operation. of the same., as described in` 21st, 1919, and the,

detail in my aforesaid prior and.

in the present improvement, thegcrank casing 3' of A the en 'e will haveseparate chambers 4 indivixun and for the pur se hereinafter stated.

`The rotary va ve member'l is of a. hollow cylindrical form havingdiametrically aral to-.feach engine unit ranged parts or passagescorresponding in ers number with the number-.of engine cylin andpreferably having the pro essive arrangement .with relation to' eac,other described in my prior patents' aforesaid, with elgchof1 saidpassages 5 adapted to' `ster t e e with the combustion chamber thereof,and in inlet port. 6 of anZ engine cyhnder' the progressive rotation ofsaid valve reglster said passa the engine cylinder. .v In t i tions ortrunnions ofthe valve 1 are formed with central inlet passages 8 toconnect the hollow interior of the valve with the outer air, while themidlength portionl of the valve 1 is formed with ports municating withthe hereinafter, described air chamber of the casing2 of the valve.

Thevalve casing 2, is of a hollow, form similar to that in vmy with itsannular chamber 10v adapted to communicate and receive air drawn throughthe hollow valve 1, and to such end is formed with connecting vports 11midway its length, as shown.

Each engine cylinder 12 is formed with an annular passage 13 incommunication with the lower end of the air chamber 10 of the valvecasing 2, and adapted to receive air therefrom. At or near its lower endthe ch mber 13 communicates, in'one form of thelresent improvement, withthe inlet end of type. In said form of the improvement,

with the fuel inlet port or passage 6 of the valve casing 2 by a pipe orpassage 15, so that with a. down stroke of an engine piston 16.in thecylinder 12 of the specified structure the external air, will be'drawnthrough the hollow vulve member 1 the hollow valve casing 2 and passageor chamber 13 ofthe engine cylinder, thence through Athe carburetor 14,where the air is carburated, and thence into the combustion chamber ofsaidl engine cylinder. With such primary,v type of the engine,themovement of outer air ge 5 with the outlet port of v xe presentimprovement the end porl or passages 9'comaforesaid patents,

a carburetor 14 of any usual 'Y lou engine as an additional-:andintermediate' means for aiding in the movementfof airthrough thevalve-parts',l and .incidentally e'ect a more'thoroughscavengingoperation in the combustion chamber-of the engine.

To such ends the passage or; chamber .13

in the walls of the engine cylinder, is connected .to the interior .orclosedchamben of the crank casingA by aport orfpassage; 17.

at a. point which is uncoveredby the enginepiston 16 at or near the endof its down stroke. In. additionV said fchamber or passage 13 isconnected tot-he crank. case chamber 4:V by a port or passagelSgata-point which is uncovered by the engine piston; 16 at or near the endofits.upstroke., g

The operation is as ollow`s:.- In the position of' he engine partsshownin Fig. 1,V the engine piston 16 is at .the commencement ofitsdown-Stroke" to eiect an introduction ofrfuel v.into the .combustionchamber. In such movement of the` piston, outer air is drawn through-the'interior of the hollowvalve l, the hollow'valve casing 2 and wallchamber .13; of the engine cyl:- inder, to exert a ycooling action onthe part, thence through 'the carburetor 14', Atoorm a fuel charge, andfrom thencethroughthe inlet ports 5, 6, and 6' -into the combustiochamber of the engine- As the engine piston 16 nearsltheend of its downstroke, the port or'.`passage 17 in the cylinder wall is uncovered. andany exe cess pressure of air in the closed chamber 4 of the crank casing3, passes into the combustion chamber and addmore ait'tothe uncompressedcharge oflfuel therein.

In the succeeding upstroke olf.` the engine piston 16, thesame'acts tocreate a partial vacuum in the closedcrank casing 3, and as thepistonnears-the end of such upstroke the port '18 in the-cylinder wall isuncovered.' v`'The partiall vacuum; existing in the crankcasing'-3,"above set forth, acts todraw in a .supply of outer airthrough the interior of the' hollow valvev l, the hollow valve casing 2,and wall-chamber 13 of the engine cylinder, into the crank easing untila balance of atmospheric pressure in said crank casing'isattained. Bysuch arrangement" additional cooling eli'ect on the enginep'artsisattained inanother part. of cycle of' operation ofthe same, ldifferentfrom that above described.

In the succeeding upstroke of the engine piston 16, the fuel charge iscompressed and fired, and in down stroke following, and as the pistonnears the end of such down stroke, the port 17 in the cylinder wall isis'of uncovered, to admit air compressed in the l ,crank easing 3, intothe combustion chamber to aid in scaven in the Same.

. -,:Hayi`ng .thusful y ascribed my invention what I Vclaim and desireto secure by Letters Patent, is:.-..-... I

v 2 l, ,Inv `anexplosion engine, .the comblnation of 4a cylinder,. apistqn,..a:closed crank casinggawalve casing arranged at one end ofthecyl-indenand formed with an annular .-,chamber,. ^a...re volublevalve .member arranged .in said valve casing and Lhaving a hollowinterior open at an tend; and connected'at a Zpoint .-,ren1o te f .romsaid open `,Vendi with the annular chamber ofv thevalve casing-the-valve and i.valve casing yhaving registering..-fuel-inlet passages, acarburetor having communication -at lonel end .with theannular'chamberbf the valve casing and .at the other end with theiuelinlet passages Aof the valve and valve -casing'f 2. In an.v explosionengine, .the combinationof a cylinder, a-v.piston, a closed crankcasing, a `valve vcasing l)arranged at one end 'ofthe cylinder andformed with .an annular chamber, a revoluble valve member arranged.insaid 1 valve vcasing and. having 'a `hollow interiorA open atitsrespective ends wand; .connected `ari-...its midlength with theannularchamberof fthe =valvecasing the fval've and .valve casing havingregistering fuel.'in let passages, a .carburetor havingcommunicationatone end with the annular vchamber of the valve-casingandat the other end with the'fuel inlet passage ofthe valve andvalvecasing.- v

3.1In` A'an yexplosion engine', the combination^of acylinder, a piston,a 'closed crank fcasing` he cylinder having a passage in its wall -a d aAport;connectingsaid passage `with the i terior of the crank casing at apoint uncogered by the. enginepiston at the end of its upstroke, apiston, a valve casing arranged at one-.endof the cylinder and formedwith an annularchamber having communication withthe passage in the wallof the c linder, a revoluble'valve member 'arrange in-said valve casingand having a hollow interior open atan end and connected atfapointremote from-said open end 'with-the annular chamber of the 4 valvecasing, the'walve and thervalve casing having registeringfuel--inlet'passages, va carburetor connected at one end with thepassage in the wall of the-cylinder and at the othcr'end with the fuelinletpassagcs ofthe valve and valve casing;

4,'. In. an' explosion engine, the combina- -tion-of -acylinderfapiston, a' closed crank -"casin'g the cylinder having apassagein its wall and a port connecting said passage with ,the interior of thecrank casing at a point uncovered by the engine piston at the end of itsupstroke, a piston, a valve casin arranged at one end of the cylinder anformed with an annular chamber having communication with the passage inthe Wall of thecylinder, a revoluble valve member arranged in said valvecasing and having a hollow interior open at its respective ends andconnected at its midlength with the annular chamber of the valve casing,the valve and the valve casing having registering fuel inlet passages, acarburaor conifisct` ed at one end with the passage in thevall of allecylinder and at tile nher and. with the 'fuel inlet passages of thevalve valve casing.

Signed at Leili, California, this 7 of October-1923- JAMES SHA??

